sedative-hypnotic vs sedative-hypnotic drug

sedative-hypnotic and sedative-hypnotic drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
sedative-hypnotic	Yes	No	No	No
sedative-hypnotic drug	Yes	No	No	No

As nouns, sedative-hypnotic and sedative-hypnotic drug are synonyms defined as:

sedative-hypnotic and sedative-hypnotic drug: a sedative that depresses activity of the central nervous system and reduces anxiety and induces sleep

sedative-hypnotic (noun)	sedative-hypnotic drug (noun)
a sedative that depresses activity of the central nervous system and reduces anxiety and induces sleep	a sedative that depresses activity of the central nervous system and reduces anxiety and induces sleep